Thermoelectric percolation phenomena in carbon fiber-reinforced concrete

Variation of the Seebeck coefficient with hydrogen content in carbon microfilaments

“…The values obtained in this study for the as-supplied ex-PAN fibres are similar to those previously reported by Sun et al [26]. Furthermore, it has been reported that the Seebeck's coefficient of pitch-based carbon fibres is also positive [27].…”

“…Furthermore, it has been reported that the Seebeck's coefficient of pitch-based carbon fibres is also positive [27]. This p-type behaviour has previously been ascribed to the thermal treatment in the range 873-2,023 K to which these fibres were submitted during fabrication as such treatment produces a large excess of positive holes in the valence band [26].…”

“…Likewise, the fact that the Seebeck's coefficient of such economically affordable carbon fibres can be improved simply by hydrogen adsorption could have interesting industrial applications. For instance, it has been shown that Portland concrete containing 2 wt% short polyacrylonitrile-based carbon fibres shows a significant TEP [26], and other studies have concerned the treatment of carbon fibres to ensure their optimal use as a thermoelectric material [32]. It is also well established that reinforced concrete can be used to sense the temperature inside buildings, etc.…”

Composite materials for thermoelectric applications

“…The carbon fiber contributes to hole conduction [42][43][44], thus making the absolute thermoelectric power of the cement-matrix composite more positive [41]. By using intercalated carbon fiber, which provides even more holes, the absolute thermoelectric power becomes even more positive [59].…”

Mechanical and Durability Performance of Polyacrylonitrile Fiber Reinforced Concrete

“…By adding suitable volume fraction of fibers, the durability of freezing/thawing resistance of concrete will be improved remarkably. Sun et al 11 put the short polyacrylonitrile-based carbon fibers (0.2~2.0 wt.%) in concrete and tested the thermoelectric power (TEP) and conductivity. TEP in CFRC increases, with the content of short carbon fiber increasing from 0.2 to 1.0 wt.%.…”